PLEASE HELP Find each unknown number.

12 is 150% of what number?
5 is 50% of what number?
10%of what number is 300?
5% of what number is 72?
20 is 80% of what number?

Is there an x intercept in the equation 60*1.15^x

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.